4.6 Article

Enhanced photovoltaic performance of CdSe quantum dot-sensitized solar cells with Eu-doped TiO2 photoanode

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Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s00339-023-07027-9

Keywords

QDSCs; TiO2; Eu doping; Power conversion efficiency

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In this study, Eu-doped TiO2 nanoparticles with different doping percentages were synthesized by sol-gel method. It was found that doping Eu element can modify the band structure of TiO2 and improve the efficiency of the solar cells.
In this work, different percentages of Eu-doped TiO2 nanoparticles were synthesized by sol-gel method. The bandgap and conduction band minimum (CBM) of TiO2 nanoparticles doped by 0.075 at% Eu element is reduced from 3.43 and - 3.93 eV to 3.09 and - 4.25 eV, respectively, deduced from the results of ultraviolet-visible (UV-Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurement compared with un-doped TiO2. As the increase of Eu concentration, short-circuit photocurrent density J(sc) of CdSe quantum dot-sensitized solar cells (QDSCs) increases from 10.86 to 13.86 mA/cm(2), while open-circuit voltage V-oc is almost invariable. Optimal power conversion efficiency (PCE) of 4.03% is achieved for CdSe QDSCs with 0.075 at% Eu-doped TiO2 film. Compared with un-doped devices, the decrease of the chemical capacitance C-mu and the increase of recombination resistance R-rec of QDSCs based on the 0.075 at% Eu-doped TiO2 photoanodes can facilitate charge extraction and suppress charge recombination at the TiO2/electrolyte interface.

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